Scene length is also a handy device for emphasizing the type of action you're filming. To accentuate fast action, include many short scenes about 2 or 3 seconds long. For lazy, slow, plodding subjects, you might take one or two scenes about 12 seconds long.
Most of your scenes will probably run from 5 to 13 seconds. Too many short, 5-second scenes may leave your audience exhausted, or a succession of scenes running longer than 13 seconds may induce slumber. Strive for variety in scene length, with short scenes following long scenes, and with each scene lasting just long enough to contribute its special piece of action.
